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<a name="1" href="#1">1</a>   <strong>package</strong> <a href="../../../../org/apache/torque/adapter/package-summary.html">org.apache.torque.adapter</a>;
<a name="2" href="#2">2</a>   
<a name="3" href="#3">3</a>   <em class="comment">/*</em>
<a name="4" href="#4">4</a>   <em class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
<a name="5" href="#5">5</a>   <em class="comment"> * or more contributor license agreements.  See the NOTICE file</em>
<a name="6" href="#6">6</a>   <em class="comment"> * distributed with this work for additional information</em>
<a name="7" href="#7">7</a>   <em class="comment"> * regarding copyright ownership.  The ASF licenses this file</em>
<a name="8" href="#8">8</a>   <em class="comment"> * to you under the Apache License, Version 2.0 (the</em>
<a name="9" href="#9">9</a>   <em class="comment"> * "License"); you may not use this file except in compliance</em>
<a name="10" href="#10">10</a>  <em class="comment"> * with the License.  You may obtain a copy of the License at</em>
<a name="11" href="#11">11</a>  <em class="comment"> *</em>
<a name="12" href="#12">12</a>  <em class="comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="13" href="#13">13</a>  <em class="comment"> *</em>
<a name="14" href="#14">14</a>  <em class="comment"> * Unless required by applicable law or agreed to in writing,</em>
<a name="15" href="#15">15</a>  <em class="comment"> * software distributed under the License is distributed on an</em>
<a name="16" href="#16">16</a>  <em class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
<a name="17" href="#17">17</a>  <em class="comment"> * KIND, either express or implied.  See the License for the</em>
<a name="18" href="#18">18</a>  <em class="comment"> * specific language governing permissions and limitations</em>
<a name="19" href="#19">19</a>  <em class="comment"> * under the License.</em>
<a name="20" href="#20">20</a>  <em class="comment"> */</em>
<a name="21" href="#21">21</a>  
<a name="22" href="#22">22</a>  <strong>import</strong> java.sql.Connection;
<a name="23" href="#23">23</a>  <strong>import</strong> java.sql.SQLException;
<a name="24" href="#24">24</a>  <strong>import</strong> java.sql.Statement;
<a name="25" href="#25">25</a>  <strong>import</strong> java.text.SimpleDateFormat;
<a name="26" href="#26">26</a>  <strong>import</strong> java.util.Date;
<a name="27" href="#27">27</a>  <strong>import</strong> java.util.HashSet;
<a name="28" href="#28">28</a>  <strong>import</strong> java.util.ListIterator;
<a name="29" href="#29">29</a>  <strong>import</strong> java.util.Set;
<a name="30" href="#30">30</a>  
<a name="31" href="#31">31</a>  <strong>import</strong> org.apache.torque.util.Query;
<a name="32" href="#32">32</a>  <strong>import</strong> org.apache.torque.util.UniqueList;
<a name="33" href="#33">33</a>  
<a name="34" href="#34">34</a>  <em>/**<em>*</em></em>
<a name="35" href="#35">35</a>  <em> * This code should be used for an Oracle database pool.</em>
<a name="36" href="#36">36</a>  <em> *</em>
<a name="37" href="#37">37</a>  <em> * @author &lt;a href="<a href="mailto:jon@clearink.com" target="alexandria_uri">mailto:jon@clearink.com</a>">Jon S. Stevens&lt;/a></em>
<a name="38" href="#38">38</a>  <em> * @author &lt;a href="<a href="mailto:bmclaugh@algx.net" target="alexandria_uri">mailto:bmclaugh@algx.net</a>">Brett McLaughlin&lt;/a></em>
<a name="39" href="#39">39</a>  <em> * @author &lt;a href="<a href="mailto:bschneider@vecna.com" target="alexandria_uri">mailto:bschneider@vecna.com</a>">Bill Schneider&lt;/a></em>
<a name="40" href="#40">40</a>  <em> * @author &lt;a href="<a href="mailto:dlr@finemaltcoding.com" target="alexandria_uri">mailto:dlr@finemaltcoding.com</a>">Daniel Rall&lt;/a></em>
<a name="41" href="#41">41</a>  <em> * @version $Id: DBOracle.java 476550 2006-11-18 16:08:37Z tfischer $</em>
<a name="42" href="#42">42</a>  <em> */</em>
<a name="43" href="#43">43</a>  <strong>public</strong> <strong>class</strong> <a href="../../../../org/apache/torque/adapter/DBOracle.html">DBOracle</a> <strong>extends</strong> <a href="../../../../org/apache/torque/adapter/AbstractDBAdapter.html">AbstractDBAdapter</a>
<a name="44" href="#44">44</a>  {
<a name="45" href="#45">45</a>      <em>/**<em>*</em></em>
<a name="46" href="#46">46</a>  <em>     * Serial version</em>
<a name="47" href="#47">47</a>  <em>     */</em>
<a name="48" href="#48">48</a>      <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = 8966976210230241194L;
<a name="49" href="#49">49</a>  
<a name="50" href="#50">50</a>      <em>/**<em>* date format used in getDateString() */</em></em>
<a name="51" href="#51">51</a>      <strong>private</strong> <strong>static</strong> <strong>final</strong> String DATE_FORMAT = <span class="string">"dd-MM-yyyy HH:mm:ss"</span>;
<a name="52" href="#52">52</a>  
<a name="53" href="#53">53</a>      <em>/**<em>*</em></em>
<a name="54" href="#54">54</a>  <em>     * Empty constructor.</em>
<a name="55" href="#55">55</a>  <em>     */</em>
<a name="56" href="#56">56</a>      <strong>protected</strong> <a href="../../../../org/apache/torque/adapter/DBOracle.html">DBOracle</a>()
<a name="57" href="#57">57</a>      {
<a name="58" href="#58">58</a>      }
<a name="59" href="#59">59</a>  
<a name="60" href="#60">60</a>      <em>/**<em>*</em></em>
<a name="61" href="#61">61</a>  <em>     * This method is used to ignore case.</em>
<a name="62" href="#62">62</a>  <em>     *</em>
<a name="63" href="#63">63</a>  <em>     * @param in The string to transform to upper case.</em>
<a name="64" href="#64">64</a>  <em>     * @return The upper case string.</em>
<a name="65" href="#65">65</a>  <em>     */</em>
<a name="66" href="#66">66</a>      <strong>public</strong> String toUpperCase(String in)
<a name="67" href="#67">67</a>      {
<a name="68" href="#68">68</a>          <strong>return</strong> <strong>new</strong> StringBuffer(<span class="string">"UPPER("</span>).append(in).append(<span class="string">")"</span>).toString();
<a name="69" href="#69">69</a>      }
<a name="70" href="#70">70</a>  
<a name="71" href="#71">71</a>      <em>/**<em>*</em></em>
<a name="72" href="#72">72</a>  <em>     * This method is used to ignore case.</em>
<a name="73" href="#73">73</a>  <em>     *</em>
<a name="74" href="#74">74</a>  <em>     * @param in The string whose case to ignore.</em>
<a name="75" href="#75">75</a>  <em>     * @return The string in a case that can be ignored.</em>
<a name="76" href="#76">76</a>  <em>     */</em>
<a name="77" href="#77">77</a>      <strong>public</strong> String ignoreCase(String in)
<a name="78" href="#78">78</a>      {
<a name="79" href="#79">79</a>          <strong>return</strong> <strong>new</strong> StringBuffer(<span class="string">"UPPER("</span>).append(in).append(<span class="string">")"</span>).toString();
<a name="80" href="#80">80</a>      }
<a name="81" href="#81">81</a>  
<a name="82" href="#82">82</a>      <em>/**<em>*</em></em>
<a name="83" href="#83">83</a>  <em>     * This method is used to format any date string.</em>
<a name="84" href="#84">84</a>  <em>     *</em>
<a name="85" href="#85">85</a>  <em>     * @param date the Date to format</em>
<a name="86" href="#86">86</a>  <em>     * @return The date formatted String for Oracle.</em>
<a name="87" href="#87">87</a>  <em>     */</em>
<a name="88" href="#88">88</a>      <strong>public</strong> String getDateString(Date date)
<a name="89" href="#89">89</a>      {
<a name="90" href="#90">90</a>          <strong>return</strong> <span class="string">"TO_DATE('"</span> + <strong>new</strong> SimpleDateFormat(DATE_FORMAT).format(date)
<a name="91" href="#91">91</a>                  + <span class="string">"', 'DD-MM-YYYY HH24:MI:SS')"</span>;
<a name="92" href="#92">92</a>      }
<a name="93" href="#93">93</a>  
<a name="94" href="#94">94</a>      <em>/**<em>*</em></em>
<a name="95" href="#95">95</a>  <em>     * @see org.apache.torque.adapter.DB#getIDMethodType()</em>
<a name="96" href="#96">96</a>  <em>     */</em>
<a name="97" href="#97">97</a>      <strong>public</strong> String getIDMethodType()
<a name="98" href="#98">98</a>      {
<a name="99" href="#99">99</a>          <strong>return</strong> SEQUENCE;
<a name="100" href="#100">100</a>     }
<a name="101" href="#101">101</a> 
<a name="102" href="#102">102</a>     <em>/**<em>*</em></em>
<a name="103" href="#103">103</a> <em>     * Returns the next key from a sequence.  Uses the following</em>
<a name="104" href="#104">104</a> <em>     * implementation:</em>
<a name="105" href="#105">105</a> <em>     *</em>
<a name="106" href="#106">106</a> <em>     * &lt;blockquote>&lt;code>&lt;pre></em>
<a name="107" href="#107">107</a> <em>     * select sequenceName.nextval from dual</em>
<a name="108" href="#108">108</a> <em>     * &lt;/pre>&lt;/code>&lt;/blockquote></em>
<a name="109" href="#109">109</a> <em>     *</em>
<a name="110" href="#110">110</a> <em>     * @param sequenceName The name of the sequence (should be of type</em>
<a name="111" href="#111">111</a> <em>     * &lt;code>String&lt;/code>).</em>
<a name="112" href="#112">112</a> <em>     * @return SQL to retreive the next database key.</em>
<a name="113" href="#113">113</a> <em>     * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object)</em>
<a name="114" href="#114">114</a> <em>     */</em>
<a name="115" href="#115">115</a>     <strong>public</strong> String getIDMethodSQL(Object sequenceName)
<a name="116" href="#116">116</a>     {
<a name="117" href="#117">117</a>         <strong>return</strong> (<span class="string">"select "</span> + sequenceName + <span class="string">".nextval from dual"</span>);
<a name="118" href="#118">118</a>     }
<a name="119" href="#119">119</a> 
<a name="120" href="#120">120</a>     <em>/**<em>*</em></em>
<a name="121" href="#121">121</a> <em>     * Locks the specified table.</em>
<a name="122" href="#122">122</a> <em>     *</em>
<a name="123" href="#123">123</a> <em>     * @param con The JDBC connection to use.</em>
<a name="124" href="#124">124</a> <em>     * @param table The name of the table to lock.</em>
<a name="125" href="#125">125</a> <em>     * @exception SQLException No Statement could be created or executed.</em>
<a name="126" href="#126">126</a> <em>     */</em>
<a name="127" href="#127">127</a>     <strong>public</strong> <strong>void</strong> lockTable(Connection con, String table) throws SQLException
<a name="128" href="#128">128</a>     {
<a name="129" href="#129">129</a>         Statement statement = con.createStatement();
<a name="130" href="#130">130</a> 
<a name="131" href="#131">131</a>         StringBuffer stmt = <strong>new</strong> StringBuffer();
<a name="132" href="#132">132</a>         stmt.append(<span class="string">"SELECT next_id FROM "</span>)
<a name="133" href="#133">133</a>                 .append(table)
<a name="134" href="#134">134</a>                 .append(<span class="string">" FOR UPDATE"</span>);
<a name="135" href="#135">135</a> 
<a name="136" href="#136">136</a>         statement.executeQuery(stmt.toString());
<a name="137" href="#137">137</a>     }
<a name="138" href="#138">138</a> 
<a name="139" href="#139">139</a>     <em>/**<em>*</em></em>
<a name="140" href="#140">140</a> <em>     * Unlocks the specified table.</em>
<a name="141" href="#141">141</a> <em>     *</em>
<a name="142" href="#142">142</a> <em>     * @param con The JDBC connection to use.</em>
<a name="143" href="#143">143</a> <em>     * @param table The name of the table to unlock.</em>
<a name="144" href="#144">144</a> <em>     * @exception SQLException No Statement could be created or executed.</em>
<a name="145" href="#145">145</a> <em>     */</em>
<a name="146" href="#146">146</a>     <strong>public</strong> <strong>void</strong> unlockTable(Connection con, String table) throws SQLException
<a name="147" href="#147">147</a>     {
<a name="148" href="#148">148</a>         <em class="comment">// Tables in Oracle are unlocked when a commit is issued.  The</em>
<a name="149" href="#149">149</a>         <em class="comment">// user may have issued a commit but do it here to be sure.</em>
<a name="150" href="#150">150</a>         con.commit();
<a name="151" href="#151">151</a>     }
<a name="152" href="#152">152</a> 
<a name="153" href="#153">153</a>     <em>/**<em>*</em></em>
<a name="154" href="#154">154</a> <em>     * This method is used to check whether the database supports</em>
<a name="155" href="#155">155</a> <em>     * limiting the size of the resultset.</em>
<a name="156" href="#156">156</a> <em>     *</em>
<a name="157" href="#157">157</a> <em>     * @return LIMIT_STYLE_ORACLE.</em>
<a name="158" href="#158">158</a> <em>     * @deprecated This should not be exposed to the outside</em>
<a name="159" href="#159">159</a> <em>     */</em>
<a name="160" href="#160">160</a>     <strong>public</strong> <strong>int</strong> getLimitStyle()
<a name="161" href="#161">161</a>     {
<a name="162" href="#162">162</a>         <strong>return</strong> DB.LIMIT_STYLE_ORACLE;
<a name="163" href="#163">163</a>     }
<a name="164" href="#164">164</a> 
<a name="165" href="#165">165</a>     <em>/**<em>*</em></em>
<a name="166" href="#166">166</a> <em>     * Return true for Oracle</em>
<a name="167" href="#167">167</a> <em>     * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeLimit()</em>
<a name="168" href="#168">168</a> <em>     */</em>
<a name="169" href="#169">169</a>     <strong>public</strong> <strong>boolean</strong> supportsNativeLimit()
<a name="170" href="#170">170</a>     {
<a name="171" href="#171">171</a>         <strong>return</strong> <strong>true</strong>;
<a name="172" href="#172">172</a>     }
<a name="173" href="#173">173</a> 
<a name="174" href="#174">174</a>     <em>/**<em>*</em></em>
<a name="175" href="#175">175</a> <em>     * Return true for Oracle</em>
<a name="176" href="#176">176</a> <em>     * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeOffset()</em>
<a name="177" href="#177">177</a> <em>     */</em>
<a name="178" href="#178">178</a>     <strong>public</strong> <strong>boolean</strong> supportsNativeOffset()
<a name="179" href="#179">179</a>     {
<a name="180" href="#180">180</a>         <strong>return</strong> <strong>true</strong>;
<a name="181" href="#181">181</a>     }
<a name="182" href="#182">182</a> 
<a name="183" href="#183">183</a>     <em>/**<em>*</em></em>
<a name="184" href="#184">184</a> <em>     * Build Oracle-style query with limit or offset.</em>
<a name="185" href="#185">185</a> <em>     * If the original SQL is in variable: query then the requlting</em>
<a name="186" href="#186">186</a> <em>     * SQL looks like this:</em>
<a name="187" href="#187">187</a> <em>     * &lt;pre></em>
<a name="188" href="#188">188</a> <em>     * SELECT B.* FROM (</em>
<a name="189" href="#189">189</a> <em>     *          SELECT A.*, rownum as TORQUE$ROWNUM FROM (</em>
<a name="190" href="#190">190</a> <em>     *                  query</em>
<a name="191" href="#191">191</a> <em>     *          ) A</em>
<a name="192" href="#192">192</a> <em>     *     ) B WHERE B.TORQUE$ROWNUM > offset AND B.TORQUE$ROWNUM</em>
<a name="193" href="#193">193</a> <em>     *     &lt;= offset + limit</em>
<a name="194" href="#194">194</a> <em>     * &lt;/pre></em>
<a name="195" href="#195">195</a> <em>     *</em>
<a name="196" href="#196">196</a> <em>     * @param query The query to modify</em>
<a name="197" href="#197">197</a> <em>     * @param offset the offset Value</em>
<a name="198" href="#198">198</a> <em>     * @param limit the limit Value</em>
<a name="199" href="#199">199</a> <em>     */</em>
<a name="200" href="#200">200</a>     <strong>public</strong> <strong>void</strong> generateLimits(<a href="../../../../org/apache/torque/util/Query.html">Query</a> query, <strong>int</strong> offset, <strong>int</strong> limit)
<a name="201" href="#201">201</a>     {
<a name="202" href="#202">202</a>         StringBuffer preLimit = <strong>new</strong> StringBuffer()
<a name="203" href="#203">203</a>         .append(<span class="string">"SELECT B.* FROM ( "</span>)
<a name="204" href="#204">204</a>         .append(<span class="string">"SELECT A.*, rownum AS TORQUE$ROWNUM FROM ( "</span>);
<a name="205" href="#205">205</a> 
<a name="206" href="#206">206</a>         StringBuffer postLimit = <strong>new</strong> StringBuffer()
<a name="207" href="#207">207</a>                 .append(<span class="string">" ) A "</span>)
<a name="208" href="#208">208</a>                 .append(<span class="string">" ) B WHERE "</span>);
<a name="209" href="#209">209</a> 
<a name="210" href="#210">210</a>         <strong>if</strong> (offset > 0)
<a name="211" href="#211">211</a>         {
<a name="212" href="#212">212</a>             postLimit.append(<span class="string">" B.TORQUE$ROWNUM > "</span>)
<a name="213" href="#213">213</a>                     .append(offset);
<a name="214" href="#214">214</a> 
<a name="215" href="#215">215</a>             <strong>if</strong> (limit >= 0)
<a name="216" href="#216">216</a>             {
<a name="217" href="#217">217</a>                 postLimit.append(<span class="string">" AND B.TORQUE$ROWNUM &lt;= "</span>)
<a name="218" href="#218">218</a>                         .append(offset + limit);
<a name="219" href="#219">219</a>             }
<a name="220" href="#220">220</a>         }
<a name="221" href="#221">221</a>         <strong>else</strong>
<a name="222" href="#222">222</a>         {
<a name="223" href="#223">223</a>             postLimit.append(<span class="string">" B.TORQUE$ROWNUM &lt;= "</span>)
<a name="224" href="#224">224</a>                     .append(limit);
<a name="225" href="#225">225</a>         }
<a name="226" href="#226">226</a> 
<a name="227" href="#227">227</a>         query.setPreLimit(preLimit.toString());
<a name="228" href="#228">228</a>         query.setPostLimit(postLimit.toString());
<a name="229" href="#229">229</a>         query.setLimit(<strong>null</strong>);
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a>         <em class="comment">// the query must not contain same column names or aliases.</em>
<a name="232" href="#232">232</a>         <em class="comment">// Find double column names and aliases and create unique aliases</em>
<a name="233" href="#233">233</a>         <em class="comment">// TODO: does not work for functions yet</em>
<a name="234" href="#234">234</a>         <a href="../../../../org/apache/torque/util/UniqueList.html">UniqueList</a> selectColumns = query.getSelectClause();
<a name="235" href="#235">235</a>         <strong>int</strong> replacementSuffix = 0;
<a name="236" href="#236">236</a>         Set columnNames = <strong>new</strong> HashSet();
<a name="237" href="#237">237</a>         <em class="comment">// first pass: only remember aliased columns</em>
<a name="238" href="#238">238</a>         <em class="comment">// No replacements need to take place because double aliases</em>
<a name="239" href="#239">239</a>         <em class="comment">// are not allowed anyway</em>
<a name="240" href="#240">240</a>         <em class="comment">// So alias names will be retained</em>
<a name="241" href="#241">241</a>         <strong>for</strong> (ListIterator columnIt = selectColumns.listIterator();
<a name="242" href="#242">242</a>                 columnIt.hasNext();)
<a name="243" href="#243">243</a>         {
<a name="244" href="#244">244</a>             String selectColumn = (String) columnIt.next();
<a name="245" href="#245">245</a> 
<a name="246" href="#246">246</a>             <em class="comment">// check for sql function</em>
<a name="247" href="#247">247</a>             <strong>if</strong> ((selectColumn.indexOf('(') != -1)
<a name="248" href="#248">248</a>                 || (selectColumn.indexOf(')') != -1))
<a name="249" href="#249">249</a>             {
<a name="250" href="#250">250</a>                 <em class="comment">// Sql function. Disregard.</em>
<a name="251" href="#251">251</a>                 <strong>continue</strong>;
<a name="252" href="#252">252</a>             }
<a name="253" href="#253">253</a> 
<a name="254" href="#254">254</a>             <em class="comment">// check if alias name exists</em>
<a name="255" href="#255">255</a>             <strong>int</strong> spacePos = selectColumn.lastIndexOf(' ');
<a name="256" href="#256">256</a>             <strong>if</strong> (spacePos == -1)
<a name="257" href="#257">257</a>             {
<a name="258" href="#258">258</a>                 <em class="comment">// no alias, disregard for now</em>
<a name="259" href="#259">259</a>                 <strong>continue</strong>;
<a name="260" href="#260">260</a>             }
<a name="261" href="#261">261</a> 
<a name="262" href="#262">262</a>             String aliasName = selectColumn.substring(spacePos + 1);
<a name="263" href="#263">263</a>             columnNames.add(aliasName);
<a name="264" href="#264">264</a>         }
<a name="265" href="#265">265</a> 
<a name="266" href="#266">266</a>         <em class="comment">// second pass. Regard ordinary columns only</em>
<a name="267" href="#267">267</a>         <strong>for</strong> (ListIterator columnIt = selectColumns.listIterator();
<a name="268" href="#268">268</a>                 columnIt.hasNext();)
<a name="269" href="#269">269</a>         {
<a name="270" href="#270">270</a>             String selectColumn = (String) columnIt.next();
<a name="271" href="#271">271</a> 
<a name="272" href="#272">272</a>             <em class="comment">// check for sql function</em>
<a name="273" href="#273">273</a>             <strong>if</strong> ((selectColumn.indexOf('(') != -1)
<a name="274" href="#274">274</a>                 || (selectColumn.indexOf(')') != -1))
<a name="275" href="#275">275</a>             {
<a name="276" href="#276">276</a>                 <em class="comment">// Sql function. Disregard.</em>
<a name="277" href="#277">277</a>                 <strong>continue</strong>;
<a name="278" href="#278">278</a>             }
<a name="279" href="#279">279</a> 
<a name="280" href="#280">280</a>             {
<a name="281" href="#281">281</a>                 <strong>int</strong> spacePos = selectColumn.lastIndexOf(' ');
<a name="282" href="#282">282</a>                 <strong>if</strong> (spacePos != -1)
<a name="283" href="#283">283</a>                 {
<a name="284" href="#284">284</a>                     <em class="comment">// alias, already processed in first pass</em>
<a name="285" href="#285">285</a>                     <strong>continue</strong>;
<a name="286" href="#286">286</a>                 }
<a name="287" href="#287">287</a>             }
<a name="288" href="#288">288</a>             <em class="comment">// split into column name and tableName</em>
<a name="289" href="#289">289</a>             String column;
<a name="290" href="#290">290</a>             {
<a name="291" href="#291">291</a>                 <strong>int</strong> dotPos = selectColumn.lastIndexOf('.');
<a name="292" href="#292">292</a>                 <strong>if</strong> (dotPos != -1)
<a name="293" href="#293">293</a>                 {
<a name="294" href="#294">294</a>                     column = selectColumn.substring(dotPos + 1);
<a name="295" href="#295">295</a>                 }
<a name="296" href="#296">296</a>                 <strong>else</strong>
<a name="297" href="#297">297</a>                 {
<a name="298" href="#298">298</a>                     column = selectColumn;
<a name="299" href="#299">299</a>                 }
<a name="300" href="#300">300</a>             }
<a name="301" href="#301">301</a>             <strong>if</strong> (columnNames.contains(column))
<a name="302" href="#302">302</a>             {
<a name="303" href="#303">303</a>                 <em class="comment">// column needs to be aliased</em>
<a name="304" href="#304">304</a>                 <em class="comment">// get replacement name</em>
<a name="305" href="#305">305</a>                 String aliasName;
<a name="306" href="#306">306</a>                 <strong>do</strong>
<a name="307" href="#307">307</a>                 {
<a name="308" href="#308">308</a>                     aliasName = <span class="string">"a"</span> + replacementSuffix;
<a name="309" href="#309">309</a>                     ++replacementSuffix;
<a name="310" href="#310">310</a>                 }
<a name="311" href="#311">311</a>                 <strong>while</strong> (columnNames.contains(aliasName));
<a name="312" href="#312">312</a> 
<a name="313" href="#313">313</a>                 selectColumn = selectColumn + <span class="string">" "</span> + aliasName;
<a name="314" href="#314">314</a>                 columnIt.set(selectColumn);
<a name="315" href="#315">315</a>                 columnNames.add(aliasName);
<a name="316" href="#316">316</a>             }
<a name="317" href="#317">317</a>             <strong>else</strong>
<a name="318" href="#318">318</a>             {
<a name="319" href="#319">319</a>                 columnNames.add(column);
<a name="320" href="#320">320</a>             }
<a name="321" href="#321">321</a>         }
<a name="322" href="#322">322</a>     }
<a name="323" href="#323">323</a> 
<a name="324" href="#324">324</a>     <em>/**<em>*</em></em>
<a name="325" href="#325">325</a> <em>     * This method is for the SqlExpression.quoteAndEscape rules.  The rule is,</em>
<a name="326" href="#326">326</a> <em>     * any string in a SqlExpression with a BACKSLASH will either be changed to</em>
<a name="327" href="#327">327</a> <em>     * "&#47;&#47;" or left as "\&quot;.  SapDB does not need the escape character.</em>
<a name="328" href="#328">328</a> <em>     *</em>
<a name="329" href="#329">329</a> <em>     * @return false.</em>
<a name="330" href="#330">330</a> <em>     */</em>
<a name="331" href="#331">331</a>     <strong>public</strong> <strong>boolean</strong> escapeText()
<a name="332" href="#332">332</a>     {
<a name="333" href="#333">333</a>         <strong>return</strong> false;
<a name="334" href="#334">334</a>     }
<a name="335" href="#335">335</a> 
<a name="336" href="#336">336</a>     <em>/**<em>*</em></em>
<a name="337" href="#337">337</a> <em>     * Whether an escape clause in like should be used.</em>
<a name="338" href="#338">338</a> <em>     * Example : select * from AUTHOR where AUTHOR.NAME like '\_%' ESCAPE '\';</em>
<a name="339" href="#339">339</a> <em>     *</em>
<a name="340" href="#340">340</a> <em>     * Oracle needs this, so this implementation always returns</em>
<a name="341" href="#341">341</a> <em>     * &lt;code>true&lt;/code>.</em>
<a name="342" href="#342">342</a> <em>     *</em>
<a name="343" href="#343">343</a> <em>     * @return whether the escape clause should be appended or not.</em>
<a name="344" href="#344">344</a> <em>     */</em>
<a name="345" href="#345">345</a>     <strong>public</strong> <strong>boolean</strong> useEscapeClauseForLike()
<a name="346" href="#346">346</a>     {
<a name="347" href="#347">347</a>         <strong>return</strong> <strong>true</strong>;
<a name="348" href="#348">348</a>     }
<a name="349" href="#349">349</a> }
</pre>
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